ADS8505IDB

Analog To Digital Converters (ADC) Overview

The ADS8505IDB is a 16-bit, 250-kSPS successive approximation register (SAR) analog-to-digital converter from Texas Instruments. It operates on a single +5-V supply with typical power dissipation of 70 mW at full speed. The device features a standard ±10-V input range and includes an internal 2.5-V reference. Key electrical specifications include a maximum integral nonlinearity (INL) of ±4 LSB and differential nonlinearity (DNL) of ±2 LSB for the 'I' grade. It utilizes a parallel data interface with three-state drivers and is housed in a 28-pin SSOP package.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 250-kSPS throughput rate
• Single +5-V supply operation with low power consumption
• Standard ±10-V bipolar input range via internal resistor divider
• Internal or external reference options with integrated buffer

Analog To Digital Converters (ADC) Applications

• Industrial process control systems
• Data acquisition systems
• Medical equipment
• Instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific accuracy grade ('I' vs 'B') required for the application, as INL and SNAD specifications differ significantly between grades. Confirm that the 28-pin SSOP package matches the PCB footprint. Ensure the design accounts for the industrial temperature range of -40°C to 85°C. Check for moisture sensitivity levels if long-term storage or reflow soldering profiles are critical to the manufacturing process.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS8505IDB when a high-speed, mid-resolution ADC with a wide input voltage range is needed without requiring dual supplies. The internal reference simplifies design but may limit ultimate precision compared to external references; consider the 'B' grade variant if tighter linearity specs (±1.5 LSB INL) are necessary. Ensure the driving circuit can handle the 11.5 kΩ input impedance and provide adequate bandwidth for the 250 kSPS sampling rate.

Analog To Digital Converters (ADC) Part Context

The ADS8505 belongs to the ADS8505 family of CMOS SAR ADCs. It is pin-compatible with the lower-speed ADS7805 and the 12-bit ADS8504/ADS7804, facilitating upgrades or downgrades in existing designs. The 'DB' suffix specifically denotes the 28-lead shrink small-outline package (SSOP). Other variants include SOIC packages (DW suffix) and tape-and-reel options (R suffix).

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same family include ADS8505IBDB (higher accuracy grade) and ADS8505IDW (SOIC package). For cross-manufacturer equivalents, verify interface compatibility (parallel) and performance metrics such as SNR and INL, as direct functional swaps may require schematic adjustments.